A still life is a drawing or painting of inanimate objects arranged together. Shading is important in still life drawings as it creates form, texture, and the illusion of depth. There are three main parts to shade - the highlight, half-tone, and cast shadow. Different shading techniques include hatching, cross-hatching, smudging, pointillism, and squirkling. Hatching uses parallel lines, cross-hatching overlaps lines, and smudging blends shades smoothly.